Electrical Machines
For an ideal transformer the winding should have

 minimum resistance on primary side and maximum resistance on secondary side
 equal resistance on primary and secondary side
 maximum resistance on primary side and least resistance on secondary side
 no ohmic resistance on either side

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Electrical Machines
A belt-driven cumulatively-compound dc generator is delivering power to the dc mains. If the Belt snaps then the machine will run as a

 cumulative compounded motor in the same direction
 differentially compounded motor in the opposite direction
 differentially compounded motor in the same direction
 cumulative compounded motor in opposite direction

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Electrical Machines
Consider the following statements about commutating poles which are fitted on most large dc Shunt motors: 1. The commutating poles are placed in the geometric neutral plane and their number is usually Equal to the number of main poles 2. The winding on the commutating poles is connected in series with the shunt-field winding on the main poles 3. The polarity of the commutating pole must be that of the next pole further ahead 4. The commutating poles neutralize the reactance voltage produced in the coil undergoing Commutation. Of these statements,

 1, 2 and 4 are correct
 2, 3 and 4 are correct
 1, 2 and 3 are correct
 1 and 4 are correct

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Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

 shift forward by 90°
 coincide with the GNA
 shift forward by more than 90°
 shift forward by less than 90°

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